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For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.

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Forum: GMCnet
 Topic: Front Bumper / Hitch mount?
Re: [GMCnet] Front Bumper / Hitch mount? [message #324170 is a reply to message #324164] Fri, 22 September 2017 01:59
johnd01 is currently offline  johnd01   United States
Messages: 67
Registered: July 2017
Location: Sacrameot
Karma:
Member
Larry,
I would guess that your boat has a low tongue weight. If you were going to
hang some weight on it going down the road I would think you should have a
small channel iron for the front bumper crossbar.
Dutch the only thing I can see is to be careful of your front axle weight
limit. The rack will act like a lever transferring weight from your rear
wheels. I did not do the math but 100 lbs a foot in front of the bumper
could add 130 labs to your front axle. Keep in mind that any weight in
front of the rear pivot point adds some weight to the front. Not know your
curb weight but I think most of us can only add about 500 lbs to our front
axle gross. Scarry to think that 2 250 lb. people in the front seats can
max out the front axle.
I am a rooky, I may be all wrong.

On Thu, Sep 21, 2017 at 7:53 PM, Larry wrote:

> My coach is a 78'. Check this and see if it will work on a 73'.
>
> http://www.gmcmhphotos.com/photos/g4744-trailer-hitch-for-front-end.html
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
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--

*John Phillips*
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Johnd01
 Topic: Barber Vintage Fest Oct 6-8
Barber Vintage Fest Oct 6-8 [message #324176] Fri, 22 September 2017 08:16
SONICJK is currently offline  SONICJK   United States
Messages: 518
Registered: April 2015
Location: Bell Buckle, TN
Karma:
Senior Member
Anyone headed to Barber this year?
If you're into motorcycles or racing it's one of the coolest things to do all year.


Justin Brady http://www.thegmcrv.com/ 1976 Palm Beach 455
Re: Barber Vintage Fest Oct 6-8 [message #324179 is a reply to message #324176] Fri, 22 September 2017 08:46
Johnny Bridges is currently offline  Johnny Bridges   United States
Messages: 6180
Registered: May 2011
Location: Braselton ga
Karma:
Senior Member
At the Augusta KC shows that weekend. Looks like fun though - it's a nice venue.

--johnny


76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. "I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
Re: Barber Vintage Fest Oct 6-8 [message #324181 is a reply to message #324179] Fri, 22 September 2017 08:52
SONICJK is currently offline  SONICJK   United States
Messages: 518
Registered: April 2015
Location: Bell Buckle, TN
Karma:
Senior Member
It's a blast. We go most years, this will be the first one where we're taking the GMC. It will be nice to not be sleeping ont he ground!

Justin Brady http://www.thegmcrv.com/ 1976 Palm Beach 455
Re: Barber Vintage Fest Oct 6-8 [message #324182 is a reply to message #324176] Fri, 22 September 2017 08:54
jknezek is currently offline  jknezek   United States
Messages: 1025
Registered: December 2007
Karma:
Senior Member
Taking the kids to Desoto Caverns this year but I keep saying I'm going to go. Hard to do on a 3 day weekend though. Only I would really enjoy it.

Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
 Topic: Petit LeMans - Road Atlanta
Re: Petit LeMans - Road Atlanta [message #324175 is a reply to message #324113] Fri, 22 September 2017 07:24
Johnny Bridges is currently offline  Johnny Bridges   United States
Messages: 6180
Registered: May 2011
Location: Braselton ga
Karma:
Senior Member
"Event Chief Scrutineer"? Ain't nobody gonna like you by the time it's over Smile
Looks like a fun race.

--johnny


76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. "I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
Re: Petit LeMans - Road Atlanta [message #324185 is a reply to message #324113] Fri, 22 September 2017 09:23
kingd is currently offline  kingd   Canada
Messages: 438
Registered: June 2004
Karma:
Senior Member
Johnny, our closed wheel class groupings are determined by Lap Times (bracket racing)
there are 5 classes for the closed wheel cars. We have an open wheel group that is for
run what you brung Formula cars with only safety preparation rules. Then we have
Formula 4 probably a uniquely Canadian class, and Formula 1200 (similar to SCCA Formula V
and Formula 1600 (like SCCA Formula Ford but with Honda Fit motors also allowed, same as
SCCA.)
I think most of the Competitors don't hate me but when I show up in their Paddock
space their usual comment is "what did we do now" Being friendly and respectful
helps with what they think about me.



DAVE KING lurker, wannabe Toronto, Ontario, Canada
 Topic: Onan carb frosting
Re: Onan carb frosting [message #324173 is a reply to message #323952] Fri, 22 September 2017 06:54
McCohens is currently offline  McCohens   United States
Messages: 19
Registered: March 2016
Location: Chalfont, PA
Karma:
Junior Member
After thinking about this further, a small fan pointed at the carb might move enough air to keep it close enough to ambient and eliminate the icing.
Re: [GMCnet] Onan carb frosting [message #324197 is a reply to message #324166] Fri, 22 September 2017 11:10
Kosier is currently offline  Kosier   United States
Messages: 754
Registered: February 2008
Karma:
Senior Member
Larry,

If the ball in the discriminator valve is stuck and allowing liquid fuel to
reach the charcoal canister, it should then drain out through
the filter in the bottom and drip on the ground. Have you changed that
filter lately? They're supposed to be a service item.

Gary Kosier
77PB w/500Cad
Newark, Ohio

--------------------------------------------------
From: "Larry"
Sent: Thursday, September 21, 2017 11:24 PM
To:
Subject: Re: [GMCnet] Onan carb frosting

> I have a new FiTech FI on my Cad 500...now don't stop reading this just
> yet. Hear me out here. Engine started running in the mid to high 11's
> Fuel/Air (FA) ratio. Computer tried its best to correct but could not so
> the engine ran really rich. So I waited until the next day to look at it.
> Started the motor and thinking that maybe I was running to much Fuel
> pressure I left the engine run and went looking for my FP gauge. When I
> came
> back, the throttle body was soaking wet and ice cold to the touch. Then
> noticed the vacuum hose going to the PCV system was wet and cold as well.
> Followed the hose to a "T" where that T'd off went to the fuel vapor
> canister. I pulled that line to the canister off and vacuum plugged it.
> Problem solved...the vapor separator in the left wheel well was bad
> allowing fuel (after a fill up) to flow to the canister and on to the TB
> where it
> came in below the throttle plates. The excess fuel below the plates was
> changing physical state from liquid to a gas releasing a lot of heat and
> in
> turn making the TB cold enough to condense water out of the air...and also
> BTW making my engine run excessively rich.
>
> My point is.... is there something going on in the carb allowing excessive
> fuel to come in below the throttle plates and excessively cool things
> down?
> If nothing else works, maybe check that carb out. I would not have
> believed it if I hadn't seen it myself.
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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 Topic: Re: [GMCnet] 4.8 MPG.
Re: [GMCnet] 4.8 MPG. [message #324191 is a reply to message #324103] Fri, 22 September 2017 10:31
richshoop is currently offline  richshoop   United States
Messages: 55
Registered: April 2017
Karma:
Member
Go to the Chief Aircraft Supply website. Find something related to EGT (Exhaust Gas Temperature), pick a manufacturer's website and follow the links. It has been too long since my airplane days to remember which manufacturer that I had installed on our Cessna 172. I'll look around a little and see if I can do some leg work for you. Sorry about the circular route. I wanted to respond as quickly as possible to prevent one of my GMC 6 wheeler friends from frying a perfectly good engine by over leaning, very easy to do.

----- Original Message -----

From: "Keith V"
To: "gmclist"
Sent: Thursday, September 21, 2017 6:55:35 AM
Subject: Re: [GMCnet] 4.8 MPG.

I've looked around for exhaust gas temperature info and didn't really find anything helpful.

any suggestions?

________________________________
From: Gmclist on behalf of richshoop-AT-comcast-DOT-net
Sent: Wednesday, September 20, 2017 11:51:41 PM
To: gmclist
Subject: Re: [GMCnet] 4.8 MPG.

Watching the exhaust gas temperature is fairly standard stuff for aircraft piston engines, lots of information available for that area of interest. Be VERY careful with the lean out, minute changes can dramatically change the engine operating characteristics, including exhaust valve damage, pre ignition due to higher operating temperatures, etc,

----- Original Message -----

From: "James Hupy"
To: "gmclist"
Sent: Wednesday, September 20, 2017 8:12:57 PM
Subject: Re: [GMCnet] 4.8 MPG.

Bob, watch the exhaust temp in just off of lean cruise. It gets into the
danger zone really fast. Talk to Randy and George before you do too much,
particularly with a heavily laden coach. It can be done, with careful
management.
Jim Hupy
Salem, Or.
78 GMC ROYALE 403

On Sep 20, 2017 7:02 PM, "Bob Dunahugh" wrote:

That's the MPG range I got too with the carb. Got about 7.5 mpg with a
17000 lbs GVW over 538 miles to Elkhart. Time will tell with more miles.
Extremely pleased with the Howell EFI. Next to add the EBL so I can read
instant MPGs, and go to the 16.5 fuel mixture in the lean burn mode. Bob
Dunahugh
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Re: [GMCnet] 4.8 MPG. [message #324203 is a reply to message #324191] Fri, 22 September 2017 12:11
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 7216
Registered: March 2004
Location: Americus, GA
Karma:
Senior Member
Here's a dual channel digital multimeter similar to the one I use to
display L & R bank EGT's:

http://www.auberins.com/index.php?main_page=product_info&cPath=5_21&products_id=357

Auber has a wide assortment of inexpensive thermocouples of 'most any
mounting type desired. I use type K's with clamp-on mounts -- drill one
hole in each exhaust pipe and clamp the thermocouple into it with the
provided "hose clamp". Could hardly be easier. I've used mine for
probably 5 years with no problems -- except that I'm amazed at how hot the
Cad500's EGT's run. The iron manifolds probably contribute to it -- 1300*F
at cruise is not unusual.

Ken H.


On Fri, Sep 22, 2017 at 11:31 AM, wrote:

> Go to the Chief Aircraft Supply website. Find something related to EGT
> (Exhaust Gas Temperature), pick a manufacturer's website and follow the
> links. It has been too long since my airplane days to remember which
> manufacturer that I had installed on our Cessna 172. I'll look around a
> little and see if I can do some leg work for you. Sorry about the circular
> route. I wanted to respond as quickly as possible to prevent one of my GMC
> 6 wheeler friends from frying a perfectly good engine by over leaning, very
> easy to do.
>
> ----- Original Message -----
>
> From: "Keith V"
> To: "gmclist"
> Sent: Thursday, September 21, 2017 6:55:35 AM
> Subject: Re: [GMCnet] 4.8 MPG.
>
> I've looked around for exhaust gas temperature info and didn't really find
> anything helpful.
>
> any suggestions?
>
> ________________________________
> From: Gmclist on behalf of
> richshoop-AT-comcast-DOT-net
> Sent: Wednesday, September 20, 2017 11:51:41 PM
> To: gmclist
> Subject: Re: [GMCnet] 4.8 MPG.
>
> Watching the exhaust gas temperature is fairly standard stuff for aircraft
> piston engines, lots of information available for that area of interest. Be
> VERY careful with the lean out, minute changes can dramatically change the
> engine operating characteristics, including exhaust valve damage, pre
> ignition due to higher operating temperatures, etc,
>
> ----- Original Message -----
>
> From: "James Hupy"
> To: "gmclist"
> Sent: Wednesday, September 20, 2017 8:12:57 PM
> Subject: Re: [GMCnet] 4.8 MPG.
>
> Bob, watch the exhaust temp in just off of lean cruise. It gets into the
> danger zone really fast. Talk to Randy and George before you do too much,
> particularly with a heavily laden coach. It can be done, with careful
> management.
> Jim Hupy
> Salem, Or.
> 78 GMC ROYALE 403
>
> On Sep 20, 2017 7:02 PM, "Bob Dunahugh" wrote:
>
> That's the MPG range I got too with the carb. Got about 7.5 mpg with a
> 17000 lbs GVW over 538 miles to Elkhart. Time will tell with more miles.
> Extremely pleased with the Howell EFI. Next to add the EBL so I can read
> instant MPGs, and go to the 16.5 fuel mixture in the lean burn mode. Bob
> Dunahugh
> _______________________________________________
> GMCnet mailing list
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>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
 Topic: Manny Tranny
Re: [GMCnet] Manny Tranny [message #324200 is a reply to message #324142] Fri, 22 September 2017 11:35
SpookyEng is currently offline  SpookyEng   United States
Messages: 134
Registered: June 2016
Location: Navarre, FL
Karma:
Senior Member

Thanks for the info, my brother-in law lives in Mountain View. We have a plan, local shop here with a great reputation will do the remove/replace. Manny is shipping a tranny out next week. We are taking a rental to get the bikes and stuff home, I'll come get the coach when it's ready..




Nelson wrote on Thu, 21 September 2017 16:40
Well, you're not exactly stuck just slowed up. I lost third gear once and was able to drive her in second at about 45 mph. Probably covered 500 miles with no other issues and if i recall it didn't even effect my mpg.
Also there is a tranny shop in Mountain View Ak that might be able to help you. I accompanied Trevor from Brisbane Australia to this Shop when his coach lost The transmission. The man insisted that he could rebuild the transmission even though Trevor had a Manny tranny in the rental car.

Sent from my iPhone
Nelson Wright

Orlando Fl.


> On Sep 21, 2017, at 1:12 PM, Wayne Rogewski wrote:
>
> Sorry to hear of it. Some folks may be on their way back home from the international in Elkhart and may not see the message..
>
> I dont know of any close, but perhaps give Manny a call and see if he cant help over the phone. I thought at one time he had a trans or two
> somewhere in the mid west if one was needed, but cant recall who may have had it for safekeeping.
>
>
> --
> 77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
> Mid Michigan
>
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JD Lisenby- USAF Ret 1978 Royale-455 Electromotive Tec2 FI & ignition Navarre, FL

[Updated on: Fri, 22 September 2017 11:36]

Report message to a moderator

Re: Manny Tranny [message #324209 is a reply to message #324119] Fri, 22 September 2017 14:08
77Royale   United States
Messages: 338
Registered: June 2014
Location: Mid Michigan
Karma:
Senior Member
Stick with it. If I recall you were on the way home when an accident happened. Coach was at the coop for a spell being fixed. Good to get all this stuff out of the way now and enjoy years of uneventful trips and memories.

Hang in there


77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy. Mid Michigan
 Topic: [GMCnet] 4.8 MPG
[GMCnet] 4.8 MPG [message #324190] Fri, 22 September 2017 09:59
glwgmc is currently offline  glwgmc   United States
Messages: 868
Registered: June 2004
Karma:
Senior Member
Interesting observation about finding better hill climbing ability running slightly richer, Justin. Maybe that is why I always felt the S and J engines in our Clasco and Royale made for wonderful driving machines for scampering around the west where mountains are a part of every trip. As I reported several times after returning from long adventures we rarely needed to downshift even on long grades yet I never allowed the engines to go to WOT (kept vacuum above 4") and didn't allow speed to drop below 45 mph.

Jerry Work
The Dovetail Joint
Fine furniture designed & hand crafted
in the 1907 former Masonic Temple building
in historic Kerby, OR
http://jerrywork.com


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Jerry & Sharon Work
78 Royale
Kerby, OR
Re: [GMCnet] 4.8 MPG [message #324193 is a reply to message #324190] Fri, 22 September 2017 10:51
SONICJK is currently offline  SONICJK   United States
Messages: 518
Registered: April 2015
Location: Bell Buckle, TN
Karma:
Senior Member
Yep that's what I found.
I only had to downshift once after richening it up a bit and that was a crazy grade.
Mileage suffers a bit but totally worth it in the mountains imho


Justin Brady http://www.thegmcrv.com/ 1976 Palm Beach 455
Re: [GMCnet] 4.8 MPG [message #324208 is a reply to message #324193] Fri, 22 September 2017 13:31
Gary Worobec is currently offline  Gary Worobec   United States
Messages: 833
Registered: May 2005
Karma:
Senior Member
I can;t recall who it is but some old sage on this list when asked how many mpg you should get with a GMC always answers “8 to 10 mpg”. Over the dozen or so years we have had our coach he is right on. No matter what you use, a carb or FI, what distributor you have, headers or no headers, a a 23 or a 26, towing or not towing it always is between “8 to 10”.


> On Sep 22, 2017, at 8:51 AM, Justin Brady wrote:
>
> Yep that's what I found.
> I only had to downshift once after richening it up a bit and that was a crazy grade.
> Mileage suffers a bit but totally worth it in the mountains imho
> --
> Justin Brady
> http://www.thegmcrv.com/
> 1976 Palm Beach 455
>
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Gary Worobec
gtw5-AT-earthlink-DOT-net
1973 23 GMC Glacier
Howell EFI/EBL




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Re: [GMCnet] 4.8 MPG [message #324212 is a reply to message #324208] Fri, 22 September 2017 14:18
Jerry Wheeler is currently offline  Jerry Wheeler   United States
Messages: 216
Registered: January 2013
Karma:
Senior Member
The old sage said "8 to 10 depending on whether you tow or not". None
other than Gene Fisher...........
JR Wheeler 78 Royale NC/OR

On Fri, Sep 22, 2017 at 2:31 PM, Gary Worobec wrote:

> I can;t recall who it is but some old sage on this list when asked how
> many mpg you should get with a GMC always answers “8 to 10 mpg”. Over the
> dozen or so years we have had our coach he is right on. No matter what you
> use, a carb or FI, what distributor you have, headers or no headers, a a 23
> or a 26, towing or not towing it always is between “8 to 10”.
>
>
>> On Sep 22, 2017, at 8:51 AM, Justin Brady wrote:
>>
>> Yep that's what I found.
>> I only had to downshift once after richening it up a bit and that was a
> crazy grade.
>> Mileage suffers a bit but totally worth it in the mountains imho
>> --
>> Justin Brady
>> http://www.thegmcrv.com/
>> 1976 Palm Beach 455
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> Gary Worobec
> gtw5-AT-earthlink-DOT-net
> 1973 23 GMC Glacier
> Howell EFI/EBL
>
>
>
>
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 Topic: Tires I just bought
Tires I just bought [message #324217] Fri, 22 September 2017 15:46
Tilerpep is currently offline  Tilerpep   United States
Messages: 211
Registered: June 2013
Location: Raleigh, NC
Karma:
Senior Member
Since tires are a pretty hefty expense, I will put forth what I just bought in case anyone else wants to compare.

Walmart had the Goodyear Wrangler HT 225/75/16 on sale (Load range E). I went on the Goodyear manufacturer web site, where it says they will price match. I used the live chat option, had them look at the Walmart price, they actually beat it by a few bucks. Flat fee to install I guess they pre-arrange with all their distributors. Then I picked who I wanted from their local list to put them on. I ordered on the Saturday before Labor Day and my shop had them Tuesday morning. I took them my two wheels (I do not let a shop jack the coach up I don't have to).

Here are the advantages I see it:
Best price I could find for name brand tire ($292 out the door for two)
Name brand tire
I knew the cost before I left home
31st week of 2017 manufacture date!!!!!!!!!! (about a month old when installed)
Had the option of an actual truck and RV place as one local installer

These tires don't have a mileage warranty, which for us is less critical than my cars.

I have tried the Dextero Walmart tires, and they seem fine, but their price went up this summer, and they manufacture date I could find at local walmarts ranged from one to five years old! So Goodyear's for $10 more per tire seemed the way to go.

I put balancing beads in two Dextero tires on Alcoa rims, but these two Goodyears I just let them use weights.

JWID



1975 Glenbrook, 1978 Royale rear bath Raleigh, NC
 Topic: Onan
Onan [message #324222] Fri, 22 September 2017 16:23
JoeR is currently offline  JoeR   Canada
Messages: 19
Registered: February 2015
Location: Ontario
Karma:
Junior Member
I have soaked the carb and cleaned it. Now I am ready to do the float adjustment.
I have read about 3 different measurements 3/32 1/16 and 1/8 .
Since this is new to me, I would like the adjustment to be a one time thing.
Is there one measuremnt that has worked the best?


Ontario Canada, 1975 Palm Beach Work in Progress
 Topic: [GMCnet] 4.8 MPG
[GMCnet] 4.8 MPG [message #324223] Fri, 22 September 2017 16:44
glwgmc is currently offline  glwgmc   United States
Messages: 868
Registered: June 2004
Karma:
Senior Member
The thread has drifted a bit. My initial post was in response to someone who indicated they were running very lean (16.x) in normal operation (at least that was my interpretation of what they said). I didn't want new owners to read that and think it ok to run that lean all the time.

I know some of the EFI units with reliable knock sensors and the smarts to do so can go into lean cruise with appropriate spark advance and get to those levels under ideal low load conditions, conditions we on the west coast don't see as often. So, from my experience, a lot of the discussion about various EFI and carb tuning topics over the years is very much colored by where and how one drives. All the options appear to work for someone, but no one solution seems optimum for everyone.

I remain a staunch advocate for all the drivability gains one can experience from EFI, but when asked, recommend the simpler modern self learning systems for our new GMC owners. Older hands, those with lots of ancient big iron engine experience, and those interested in squeezing out all the fuel economy to be had in our coaches will likely prefer the greater hands on control offered by systems like the Howell with EBL alternatives.

'nuff said from my POV........

Jerry Work
The Dovetail Joint
Fine furniture designed & hand crafted
in the 1907 former Masonic Temple building
in historic Kerby, OR
http://jerrywork.com


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Jerry & Sharon Work
78 Royale
Kerby, OR
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